Does DUOQ inflate someone's rank/mmr?

I am genuinely curious because I've been playing a lot of normal games, and I've looked at everyone's (I'm a stats nerd lol). I've noticed a trend were there's a duoq. One player will be extremely good at utilizing carry champions, and the other player will be on par with the rest of the enemy team or worse. In their ranked matches, the same story plays out and they end up hitting plat. Is that a trend? Is there a lot of people in Plat that are not supposed to be there?
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